Posted in another thread was the following:
this is an email a fellow member recieved from Toro in response to shear bolts
"Toro snow throwers do not have shear pins. The reason for this is if you hit something while snow throwing, the auger and engine will stop letting you know that something is wrong. You can then remove whatever it was that you hit, start up the machine, and continue snow throwing. If the snow thrower had shear pins, they would need to be replaced before starting the snow thrower again."
The claim above was a bit suspect so on checking it appears to be advertising hype.
Toro has been claiming the "virtual" elimination of shear pins because of the great ruggedness built into their auger designs. On checking their new models you'll find they along with the new tougher design include the same old shear pin or as they call it "screw-hh". Screw-hh is a shear bolt.
Check the drawings:
For a Toro 521 model 38052:
https://lookup3.toro.com/partdex/index.cfm?xCaller=Toro
Toro 724 38050:
https://lookup3.toro.com/partdex/index.cfm?xCaller=Toro
Toro 824 model 38083:
https://lookup3.toro.com/partdex/index.cfm?xCaller=Toro
The 521 and 724 were long runs for many years. The 824 above is for a late 90's XL model made for three years.
The 38622 is a new 2008 model and the advertising speak is that the shear pin is "virtually eliminated". The drawing shows it's still used as it has been for 30 years. Toro may have beefed up their auger assembly as they tout but still use shear bolts named screw-hh.
Here's their advertising claim:
Toro - Homeowner Snowthrowers
Body Text: Heavy-Duty Auger Gearcase Power is transferred to the serrated augers by a gearcase designed to withstand extreme stress, virtually eliminating the need for troublesome shear pins. Headlight Standard.
On the models I looked at the drawings all call out a screw-hh.
38622 2008 280000001-280999999 Auger and Housing Assembly
https://lookup3.toro.com/partdex/index.cfm?xCaller=Toro
This message was modified Feb 25, 2008 by trouts2
